Regex Whitespace

Python

In Python, the \s character in regular expressions is used to match any whitespace character:

import re

pattern = re.compile(r'\s')
match = pattern.match(' ')

To match one or more whitespace characters, you can use the + quantifier:

pattern = re.compile(r'\s+')
match = pattern.match('   ')

C#

In C#, \s is used to match any whitespace character:

using System;
using System.Text.RegularExpressions;

class Program {
    static void Main() {
        Regex regex = new Regex(@"\s");
        Match match = regex.Match(" ");
    }
}

To match one or more whitespace characters, use the + quantifier:

Regex regex = new Regex(@"\s+");
Match match = regex.Match("   ");

PHP

In PHP, \s is used to match any whitespace character:

$match = preg_match('/\s/', ' ');

To match one or more whitespace characters, use the + quantifier:

$match = preg_match('/\s+/', '   ');

SQL

In SQL, regular expression support may vary, but generally, to match whitespace, you can use the [[:space:]] character class in SQL's REGEXP or similar functions:

SELECT * FROM table WHERE column REGEXP '[[:space:]]';

This will match any string in the specified column containing at least one whitespace character.

JavaScript

In JavaScript, \s is used to match any whitespace character:

let regex = new RegExp('\\s');
let match = regex.test(' ');

To match one or more whitespace characters, use the + quantifier:

let regex = new RegExp('\\s+');
let match = regex.test('   ');

Java

In Java, \s is used to match any whitespace character:

import java.util.regex.*;

public class Main {
    public static void main(String[] args) {
        Pattern pattern = Pattern.compile("\\s");
        Matcher matcher = pattern.matcher(" ");
        boolean match = matcher.find();
    }
}

To match one or more whitespace characters, use the + quantifier:

Pattern pattern = Pattern.compile("\\s+");
Matcher matcher = pattern.matcher("   ");
boolean match = matcher.find();